One of these is essentially a physi

One of these is essentially a physical process (enactive) whilst the other two produce physical objects that are drawn or written1 (iconic, symbolic). Iconic representations drawn by hand, such as a free-hand graph, also have enactive elements in them, suggesting a broader “visuo-spatial” concept. (For instance, one senses enactively that a “continuous” graph going from negative to positive must pass through zero.)